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Observations of a GX 301-2 Apastron Flare with the X-Calibur Hard X-Ray Polarimeter Supported by NICER, the Swift XRT and BAT, and Fermi GBM
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- Abarr, Q. (author)
- Washington Univ, 1 Brookings Dr,CB 1105, St Louis, MO 63130 USA.
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- Iyer, Nirmal Kumar (author)
- KTH,Partikel- och astropartikelfysik
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- Kiss, Mozsi (author)
- KTH,Partikel- och astropartikelfysik
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- Washington Univ, 1 Brookings Dr,CB 1105, St Louis, MO 63130 USA Partikel- och astropartikelfysik (creator_code:org_t)
- 2020-03-04
- 2020
- English.
- In: Astrophysical Journal. - : Institute of Physics (IOP). - 0004-637X .- 1538-4357. ; 891:1
- Journal article (peer-reviewed)
Abstract
Subject headings
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- The accretion-powered X-ray pulsar GX 301-2 was observed with the balloon-borne X-Calibur hard X-ray polarimeter during late 2018 December, with contiguous observations by the Neutron star Interior Composition Explorer Mission (NICER) X-ray telescope, the Swift X-ray Telescope and Burst Alert Telescope, and the Fermi Gamma-ray Burst Monitor spanning several months. The observations detected the pulsar in a rare apastron flaring state coinciding with a significant spin up of the pulsar discovered with the Fermi Gamma-ray Burst Monitor. The X-Calibur, NICER, and Swift observations reveal a pulse profile strongly dominated by one main peak, and the NICER and Swift data show strong variation of the profile from pulse to pulse. The X-Calibur observations constrain for the first time the linear polarization of the 15-35 keV emission from a highly magnetized accreting neutron star, indicating a polarization degree of % (90% confidence limit) averaged over all pulse phases. We discuss the spin up and the X-ray spectral and polarimetric results in the context of theoretical predictions. We conclude with a discussion of the scientific potential of future observations of highly magnetized neutron stars with the more sensitive follow-up mission XL-Calibur.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Neutron stars
- X-ray astronomy
- Spectropolarimetry
- High mass x-ray binary stars
- Bianchi cosmology
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- ref (subject category)
- art (subject category)
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